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Mitigation of autogenous shrinkage in mortars: analysis and modeling of water migration and comparison of various internal curing materials



Title: Mitigation of autogenous shrinkage in mortars: analysis and modeling of water migration and comparison of various internal curing materials
Author(s): Benjamin J. Mohr, Kristen L. Hood, George R. Buchanan
Paper category : conference
Book title: International RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation
Editor(s): O. M. Jensen, P. Lura, K. Kovler
Print-ISBN: 2-35158-004-4
e-ISBN: 2351580052
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 127 - 136
Total Pages: 10
Nb references: 21
Language: English


Abstract: Transport of water through a matrix microstructure is largely governed by the permeability of the matrix. High performance cement-based materials that experience self-desiccation and autogenous shrinkage typically have a dense matrix of low permeability, restricting transport of internal curing water. Results in the literature indicate that the “sphere of influence,” as derived by computational simulations and experimental observations for internal curing water release from presoaked lightweight aggregates can range from 200 µm to 10 mm. This radius of moisture transport is important when considering the distribution of the internal curing materials. The distribution of materials is related to the size and dosage rate, both of which can be optimized if the distance of water transport is known. However, there is a lack of experimental research to confirm and/or refine computational models. Development of novel in situ experimental techniques to monitor the “sphere of influence” during the early stages of hydration would significantly contribute to the understanding of moisture transport away from the internal curing materials. Improved understanding of the moisture transport kinetics through high performance cement pastes is critical in developing an appreciation of the mechanisms responsible for self-desiccation and autogenous shrinkage mitigation.


Online publication: 2006-07-30
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580052.014